Photovoltaic battery maximum power tracking method

Abstract

The invention provides a photovoltaic battery maximum power tracking method. The method includes acquiring voltage and current of a photovoltaic battery panel via a voltage transformer and a Hall sensor, sending the acquired voltage and current to a DSP(digital signal processor) or a single-chip microcomputer through a voltage and current conditioning circuit, calculating power and derivative of current power to the voltage, generating a fuzzy control strategy by an MATLAB readfis function according to a membership function and a fuzzy rule list, saving the fuzzy control strategy to the DSP or the single-chip microcomputer, selecting input quantities E and EC and an output variable which is duty ratio increment delta d of an IGBT(insulated gate bipolar transistor), calculating a duty ratio increment delta d of an output variable DC / DC circuit according to the input quantities E and EC by searching a fuzzy control strategy list in the DSP or the single-chip microcomputer via a program on the basis of the input quantities E and EC, and generating PWM(pulse width modulation) signals to a switching tube by a DSP event manager according to the calculated value of the delta d. The photovoltaic battery maximum power tracking method overcome defects and problems existing in current conventional algorithms.

Description

technical field [0001] The invention relates to the technical field of photovoltaic grid-connected power generation, in particular to a method for maximum power tracking of photovoltaic cells. Background technique [0002] With the continuous consumption of fossil energy and the increasingly serious environmental pollution, vigorously developing new energy has become an irresistible trend. As a clean and renewable energy, solar energy has been paid more and more attention by countries all over the world. With the strong support of the governments of various countries, the average annual growth rate of global solar photovoltaic cell production is 60%. my country has very rich solar energy resources, with theoretical reserves reaching 1,700 billion tons of standard coal per year, and the potential for the development and utilization of solar energy resources is very broad. In recent years, under the strong pull of national projects such as the "Bright Project" pilot project ...

AI Technical Summary

Problems solved by technology

[0012] 2) The output characteristic curve of the photovoltaic array is asymmetrical on both sides of the maximum power point, and the symmetrical membership function does not take into account the differences in the characteristics of photovoltaic devices on both sides of the maximum power point and in different intervals on the left

[0015] Aiming at the problems of low tracking accuracy, slow response speed, poor adaptability and low tracking efficiency in the conventional maximum power point tracking method, and the existing fuzzy PD controller is difficult to achieve high-precision tracking of the maximum power point, etc.

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